| Abstract: |
| Traditionally, a particle trajectory in a wave tank is measured by setting a limpid grid-film on the flume for calibration and recording by a high speed camera. But this method may be sheltered from equipment and waves ,and the data loss may be occurred. In generally , the accuracy of image position is effected form wave gage, strength gage, surface line, artificial particles ,ect. Besides, it is hard to obtain particle postion accurately , because of grid paper image may have a distortion from lens. These reason are all made the traces and identify error. So, we would use the image treatment method substituted for the traditional method to study and analyse the particle trajectory. In the case of image distortion are image optical-error and the geometry physical error. The image optical-error including refraction and reflection by light passing through the flume and water in a camera, distortion of image are difference in the side expanding rate. The geometry physical error occured including viewpoint, and the geometry position error in the space, this paper can obtain correct experiment position values, and reduce the image error and get the better result. Comparing above two method, it is satisfied that the RMSE of present method is below 10% much batter than 160% passed method. |
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